Mitsubishi Lancer (4A9 engine). Manual - part 217

 

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Mitsubishi Lancer (4A9 engine). Manual - part 217

 

 

ETACS

CHASSIS ELECTRICAL

54A-530

PROBABLE CAUSES

• Malfunction of the headlamp automatic levelling-

ECU

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the headlamp auto-
matic levelling-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the headlamp automatic 

levelling-ECU. Refer to .

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the headlamp automatic levelling-

ECU. Go to Step 4.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the headlamp automatic levelling-ECU and 
the ETACS-ECU (GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

STEP 4. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the headlamp automatic levelling-ECU and 
the ETACS-ECU (GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.U0184 Audio CAN timeout

CAUTION

• If the diagnosis code No. U0184 is set to the 

ETACS-ECU, always diagnose the CAN bus 
line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

DIAGNOSTIC FUNCTION
When the signals from radio and CD player cannot 
be received, the ETACS-ECU sets the diagnosis 
code No. U0184.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5 
seconds, if the communication with the radio and CD 
player cannot be established for 2,500 ms or more, 
the ETACS-ECU determines that a problem has 
occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse (IOD fuse), or the odometer value is at 80.5 
km or more.

• ETACS-ECU system voltage is at 10−16 V.

PROBABLE CAUSES

• Malfunctions of the radio and CD player

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

ETACS

CHASSIS ELECTRICAL

54A-531

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the radio and CD 
player.

Q: Is the diagnosis code set?

YES : 

Perform the diagnosis code troubleshooting 

to the radio and CD player. Refer to .

NO : 

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0184 is set to the 
SRS-ECU, combination meter, or A/C-ECU.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the radio and CD player.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the radio and CD player and the ETACS-
ECU (Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the radio and CD player and the ETACS-
ECU (Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.U0245 Audio visual navigation unit CAN timeout

CAUTION

• If the diagnosis code No. U0245 is set to the 

ETACS-ECU, always diagnose the CAN bus 
line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

DIAGNOSTIC FUNCTION
When the signals from CAN box unit (audio visual 
navigation unit) cannot be received, the ETACS-ECU 
sets the diagnosis code No. U0245.

JUDGMENT CRITERIA
After the following statuses continue to be true for 5 
seconds, if the communication with the CAN box unit 
(audio visual navigation unit) be established for 
2,500 ms or more, the ETACS-ECU determines that 
a problem has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse (IOD fuse), or the odometer value is at 80.5 
km or more.

• ETACS-ECU system voltage is at 10−16 V.

PROBABLE CAUSES

• Malfunctions of CAN box unit

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

ETACS

CHASSIS ELECTRICAL

54A-532

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the audio visual 
navigation unit.

Q: Is the diagnosis code set?

YES : 

Perform the diagnosis code troubleshooting 

to the audio visual navigation unit. Refer to .

NO : 

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0245 is set to the 
combination meter.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the CAN box unit (audio visual 

navigation unit).

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the CAN box unit (audio visual navigation 
unit) and the ETACS-ECU (Refer to 
GROUP 00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the CAN box unit (audio visual navigation 
unit) and the ETACS-ECU (Refer to 
GROUP 00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunction ).

Code No.U0331 ECU internal error

JUDGMENT CRITERIA
If the ETACS-ECU error counter value is detected to 
be "255," the diagnosis code No. U0331 is set, and 
the ETACS-ECU is reset. The diagnosis code No. 
U0331 exists only for the past trouble.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The diagnosis is complete.

ETACS

CHASSIS ELECTRICAL

54A-533

Code No.U1004 AS&G CAN timeout

CAUTION

• If diagnosis code No. U1004 is set to the 

ETACS-ECU, always diagnose the CAN bus 
line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

DIAGNOSTIC FUNCTION
If the signal from AS&G-ECU cannot be received, the 
ETACS-ECU sets the diagnosis code No. U1004.

JUDGEMENT CRITERIA
After the following statuses continue to be true for 5 
seconds, if the communication with the AS&G-ECU 
cannot be established for 600 ms or more, the 
ETACS-ECU determines that a problem has 
occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse (IOD fuse), or the odometer value is at 80.5 
km or more.

• ETACS-ECU system voltage is at 10−16 V.

PROBABLE CAUSES

• Malfunction of the AS&G-ECU

• Malfunction of the ETACS-ECU

• Malfunction of the CAN bus

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the AS&G-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the AS&G-ECU. Refer to 

GROUP 17 

− Troubleshooting .

NO : 

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U1004 is set to the 
engine-ECU.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the AS&G-ECU.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the AS&G-ECU and the ETACS-ECU 
(GROUP 00 

− How to use Troubleshooting/

inspection Service Points 

− How to Cope 

with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The trouble can be an intermittent 
malfunction such as a poor connection or 
open circuit in the CAN bus lines between 
the AS&G-ECU and the ETACS-ECU 
(GROUP 00 

− How to use Troubleshooting/

inspection Service Points 

− How to Cope 

with Intermittent Malfunction ).

 

 

 

 

 

 

 

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